USMMLA Unsigned by signed integer matrix multiply-accumulate The unsigned by signed integer matrix multiply-accumulate instruction multiplies the 2×8 matrix of unsigned 8-bit integer values held in each 128-bit segment of the first source vector by the 8×2 matrix of signed 8-bit integer values in the corresponding segment of the second source vector. The resulting 2×2 widened 32-bit integer matrix product is then destructively added to the 32-bit integer matrix accumulator held in the corresponding segment of the addend and destination vector. This is equivalent to performing an 8-way dot product per destination element. This instruction is unpredicated. ID_AA64ZFR0_EL1.I8MM indicates whether this instruction is implemented. This instruction is illegal when executed in Streaming SVE mode, unless FEAT_SME_FA64 is implemented and enabled. Green False True True SM_0_only 0 1 0 0 0 1 0 1 1 0 0 1 0 0 1 1 0 USMMLA <Zda>.S, <Zn>.B, <Zm>.B if !IsFeatureImplemented(FEAT_SVE) || !IsFeatureImplemented(FEAT_I8MM) then UNDEFINED; constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer da = UInt(Zda); constant boolean op1_unsigned = TRUE; constant boolean op2_unsigned = FALSE; <Zda> Is the name of the third source and destination scalable vector register, encoded in the "Zda" field. <Zn> Is the name of the first source scalable vector register, encoded in the "Zn" field. <Zm> Is the name of the second source scalable vector register, encoded in the "Zm" field. CheckNonStreamingSVEEnabled(); constant integer VL = CurrentVL; constant integer segments = VL DIV 128; constant bits(VL) operand1 = Z[n, VL]; constant bits(VL) operand2 = Z[m, VL]; constant bits(VL) operand3 = Z[da, VL]; bits(VL) result = Zeros(VL); bits(128) op1, op2; bits(128) res, addend; for s = 0 to segments-1 op1 = Elem[operand1, s, 128]; op2 = Elem[operand2, s, 128]; addend = Elem[operand3, s, 128]; res = MatMulAdd(addend, op1, op2, op1_unsigned, op2_unsigned); Elem[result, s, 128] = res; Z[da, VL] = result;